Bob La Londe wrote:
I'll have to go out to the shop and take a look, but if I recall
there are still batteries in it. On the cheaper one the batteries
are not replaceable. When they go bad you throw the helmet away. So
far both of mine still work.

There's a webpage somewhere with a fellow documenting his replacement of the
batteries in his helmet. Of course I can't find it at the moment....

Jon